base.c

linux下如何实现多个定时器 timer

#include <stdlib.h>
#include <stdio.h>
#include <pcap.h>
#include <signal.h>
#include <time.h>
#include <signal.h>
struct tm *Today;
time_t Now;

struct timeval tpstart,tpend;
float  timeuse;

char timestr[18];
time_t t;
struct tm *ltime;

void handle (sigval_t v)
{	
	switch(v.sival_int)
	{
    case 1://onesec
   	break;
	case 2://ten sec
	break;
	case 3:


	break;
	default:break;
	}
  return;
}

int create (int seconds, int id)
{
  timer_t tid;
  struct sigevent se;
  struct itimerspec ts, ots;
  char stri[30];

  memset (&se, 0, sizeof (se));
  se.sigev_notify = SIGEV_THREAD;
  se.sigev_notify_function = handle;
  se.sigev_value.sival_int = id;

  if (timer_create (CLOCK_REALTIME, &se, &tid) < 0)
    {
      perror ("timer_creat");
      sprintf(stri,"timer_create [%d:%d] error!!!.",seconds,id);
      puts(stri);
      return -1;
    }

  sprintf(stri,"timer_create [%d:%d] successfully.",seconds,id);
  puts(stri);

  ts.it_value.tv_sec = seconds;
  ts.it_value.tv_nsec = 0;
  ts.it_interval.tv_sec = seconds;
  ts.it_interval.tv_nsec = 0;
  if (timer_settime (tid, TIMER_ABSTIME, &ts, &ots) < 0)
    {
      perror ("timer_settime");
      return -1;
    }
  return 0;
}


int main(int argc, char **argv) {
	
	u_int inum, i=0;
	int l,k;
	char errbuf[PCAP_ERRBUF_SIZE];
	int res;
	pcap_if_t *alldevs, *d;
	struct pcap_pkthdr *header;
	u_char *pkt_data;
	

    	
	/* The user didn't provide a packet source: Retrieve the device list */
		if (pcap_findalldevs(&alldevs, errbuf) == -1)
		{
			fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf);
			exit(1);
		}
	
	/* Print the list */
		for(d=alldevs; d; d=d->next)
		{
			printf("%d. %s", ++i, d->name);
			if (d->description)
				printf(" (%s)\n", d->description);
			else
				printf(" (No description available)\n");
		}
		
		if(i==0)
		{
			printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
			return -1;
		}
		
		//printf("Enter the interface number (1-%d):",i);
		//scanf("%d", &inum);
		inum=1;
		
		if(inum < 1 || inum > i)
		{
			printf("\nInterface number out of range.\n");
			/* Free the device list */
			pcap_freealldevs(alldevs);
			return -1;
		}
		/* Jump to the selected adapter */
		for(d=alldevs, i=0; i< inum-1 ;d=d->next, i++);
		
		/* Open the device */
		if ( (fp= pcap_open_live(d->name, 3000, 1, 1, errbuf) ) == NULL)
		{
			fprintf(stderr,"\nError opening adapter\n");
			return -1;
		}
		
	  create(1,1);
	  create(10,2);
	  create(60,3);				

while((res = pcap_next_ex( fp, &header, &pkt_data)) >= 0){

		if(res == 0)
			/* Timeout elapsed */
			continue;        
		/* print pkt timestamp and pkt len */
		//printf("%ld:%ld (%ld)\n", header->ts.tv_sec, header->ts.tv_usec, header->len);			
		
		/* Print the packet */
 /*
 
		for (i=1; (i < header->caplen + 1 ) ; i++)
		{
			printf("%.2x ", pkt_data[i-1]);
			if ( (i % LINE_LEN) == 0) printf("\n");
		}
		
		printf("\n\n");			
*/
	
	if(res == -1){
		printf("Error reading the packets: %s\n", pcap_geterr(fp));
		return -1;
		}
	}

	  return 0;
}